boynton



(No idodel.)

2 Sheets--Sheet 1. N. A. BOYNTON.

HOT AIR FURNAGE.

Patented Nov. 11

INVEN TOR WITNESSES: 96 m W A J I ATTORNEYS.

N. PETERS. PhMu-Lilhugmpher. Wnhinglun. D. C.

(No Model.) 2 Sheets-Sheet 2. N. A. BOYNTON.

HOT AIR FURNACE. No. 307,907. Patented Nov. 11, 1884.

WITNESSES; I INVENTOR? 77/ a fizw BY m 66,

' ATTORNEYS.

LII

NATHANIEL A. BOYNTON, OF NElV YORK, N. Y., ASSIGNOR TO THE BOYN- TON FURNACE COMPANY, OF SAME PLACE.

HOT AI R FU RNACE.

SPECIFICATION forming part of Letters Patent No. 307,907, dated November 11, 1884.

Application filed February 19, 1884. (N model.)

T0 all whom it may concern:

Be it known that I, NATHANIEL A. BOYN- TON, of the city, county, and State of New York, have invented certain new and useful Improvements in Hot-Air Furnaces, of which the following is a full, clear, and exact descrip- This invention relates to hot-air furnaces in which a hollow radiator of annular construc tion, and through which the products of combustion pass, is mounted on or over the dome of the furnace; and it consists in certain novel constructions of the dome and radiator and their flues or passages, and arrangement of the dome within the radiator, whereby not only compactness is insured, but a most effective circulation and distribution of the products of combustion is effected, an enlarged heating and radiating surface is obtained, and all the available heat extracted, the air to be heated is made to impinge upon and spread over a large area of heating-surface, and the dues are caused to clear themselves of soot, substantially as hereinafter described.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 represents a mainly sectional elevation of the furnace on the lines a: x in Figs. 3 and 4. Fig. 2 is a vertical section on the lines y y in Figs. 3 and 4 of the dome and radiator of the furnace. Fig. Sis an inverted View of the radiator, and Fig. i a top View of the dome of the furnace. Fig. 5 is a vertical section on the line 2 c in Fig. 2 of the dome and radiator.

A in the drawings indicates the sheet-metal casing of the furnace, which casing may be of ordinary construction; B, the corrugated castiron fire-pot of the furnace, and G the cast-iron dome thereof. The dome O is constructed with a series of upright exterior flues, D, arranged buttress fashion, at suitable distances apart around its base or lower portion, commencing for one pair of said fines on opposite sides of the fuel-feeding passage B. These lines D are open on their inner sides to the exterior of the dome, for passage of the products of combustion therefrom, and have their bottoms 0 set inclining downward toward the interior of the dome, to facilitate the return of soot to the firepot, as well as to give an upward turn to the draft. It is also preferred to make said flues tapering upward on their sides, which will further assist in preventing the adhesion of soot. The salient flues D serve, to a large extent, as radiating-surfaces for heating the air, which enters below, as at d, and circulates or passes through the furnace, finally escaping, when heated, by any number of upper outlets, 6, all as indicated by the arrows a. The other arrows, a, indicate the course or courses taken by the products of combustion to the outlet f, which connects with the chimney. The radiator F, which is also made of east-iron, and is arranged to rest on top of the exterior side fiues, D, of the dome, is in its genera'l form of arched or dome-like construction,

and consists, in part, of a hollow annulushaving a shelving or outwardly-inclining bottom,

g, as more clearly shown in Figs. 1 and 2, the circular passage h so formed being interrupted by partitions t t on opposite sides of the line of the outlet f. Said radiator F connects on the under side of its shelving bottom 9, by flues or branches D through socket-joints, as at is, with the tops of the dome-fines D, there being a like number of said flues D D, and being similarly arranged to line with one another, for the passage of the products of COIl] bustion into the circular passage h of the radiator, from which said products escape by any number of upwardly-arched or inclining and preferably tapering cross fines, G, into an upper central cavity, Z, and from there downward by a similarly arranged and arched or inclining crossflue, Gr, of larger capacity than the lines G-,to the space between the partitions z" 1', leading to the ontletf. The cross flues G G, uniting the central chamber,l,with the annular chamber 71, give to the radiator its domelike character. The air to be heated passes up within or through the open center portion of this radiator F, outside of the dome O, and out or up through the spaces at between the fiues G G, and in its passage is ex posed to an enlarged radiating surface as formed by the exposed sides of the domeflues D and radiator-fines D G G, in addition to the general surface or exposed sides of the radiator and exterior of the dome, which latter projects up within the radiator, thereby not only conducing to compactness, but insuring contact of the air with both the dome and radiator. Furthermore, the fiucs D are made flaring or of increasing area in an upward direction, as more clearly shown in Figs. 1 and '5, and which not only gives an increased radiating-surface, but causes the air to impinge upon the sides of said flues. Such flaring shape of the flues D, too, facilitates the passage and distribution of the products of combustion into the circular passage h, and the return of soot from the radiator to the flues D, and from these into the fire-pot. The arched or inclined cross-fines G and shelving bottom g of the radiator will also have a like effect or effects. The socket-joints 7a, where the flues D connect with the flues D, are strengthened and more effectually secured or closed by the introduction of a metal cuppacking, II, at each of said joints, said cup being constructed to receive up through its bottom the nipple of the socket at the top of the flue D, and to receive within it and inclose the lower end of the corresponding flue, D, as shown in Fig. 2.

By the construction and arrangement of the several flues, as described, the gaseous products of combustion will be so far retarded in their passage through the furnace as to insure the extraction of all or nearly all the available heat without objectionable obstruction of the draft. The air to be heated, in passing up over the dome 0 between the flues D, will reccive a certain amount of heat, and afterward be deflected and caused to impinge on the flaring sides of the flues I), also against the inclined bottom I/ of the annular chamber h and arched erossflues G G of the radiator, which virtually forms a hood to concentrate, as it were, the incoming or passing air and to highly heat the same. The hot gaseous products of combustion, too, rising within the arched cross-fines G, will be checked or retained, as it were, in the central upper chamber, Z, before making their descent through the outlet cross-flue G, thus insuring the full extraction of the heat. The arched cross-fines G G also effectually serve to prevent any lodgment of soot,which will fall down through or be returned by them, and so that the same can readilybe removed or pass to the fire-pot, thus leaving said flucs and the upper cham ber, Z, free and clear.

I am aware that in the patent of Chilson, granted September 26, 1854, No. 11,718, a series of interior and exterior conical radiators have been arranged above the fire-pot, so that their internal surfaces reflect back the ascending volume of unburned gases to mingle with a current of heated air from below, and that the outer ones of such series of cones have been made to communicate at their tops with an annular chamber, which in turn is in communication with a depressed central chamber and side flue. Such construction, however, I do not claim. Neither has my invention for its object reflecting back the ascending volume of unburned gases to mingle with a current of heated air from below, and the construction.

of my furnace is difl'erent both in detail and general arrangement.

In my improved furnace the hollow annular radiator F is not mounted upon a series of exterior cones arranged to project above the dome of the furnace, but it is of a sharp inclined or dome construction, itself receiving the dome O of the furnace up within it, and its central chamber, Z, instead of being a depressed one, occupies an elevated position. This construction and arrangement, in connection with the shape of the annular chamber h in its transverse section and the shape and arrangement of the flues D D, not only insures a most perfect and extended contact of the air entering the case A. with the heated surfaces of the furnace, but the hood-like radiator inclosing the upper portion of the dome G and the elevated position of the chamber Z will prevent all lodgment of soot or refuse and insure the return of the same back to the fire-pot; nor will there be any such violent check of the draft asif the central chamber, Z, were arranged to project below the annular chamber of the radiator F.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is l 1. In combination with the dome C of the furnace, the dome or hood-like radiator F, constructed and arranged to receive the dome G up within it, and consisting of an annular outer chamber, h, divided at a portion of its length to form an escape for the gaseous products of combustion, a central chamber or space, Z, arranged to project above the annular chamber I arched or upwardlydnclining flues G, arranged to conduct said products from the annular chamber h to the elevated central chamber, Z, and an arched or inclined flue, G, arranged to pass said products from the elevated chamber Z in a downwardly-in clined direction to a side outlet in the annular chamber h, substantially as specified.

2. In a hot-air furnace, the dome 0, provided externally with a series of upright side flues, D, in combination with the radiator F, having arched or dome shaped cross-flues, and an annular chamber, 71, having flues D, arranged to connect wit-h the side flues, D, said radiator being arranged to receive the dome 0 up within it, and being provided with a central chamber, Z, arranged to project above said annular chamber, essentially as described.

Ina hot-air furnace, the combination, with the dome 0, having exterior side fines, D, of the inclined or shelving bottom 9 of the annular portion of the radiator F, the fines D, made flaring in an upward direction, and the arched cross-fines G G, connecting the annular portion of the radiator F with a cen- I and provision is made for the radiator to clear tral upper chamber thereof, said radiator beitself of soot, substantially as specified.

ing constructed and arran ed to receive the T 7 T T do me 0 up within it, Where loy air entering up BOXLTOL' between the fines D of the dome is guided up Witnesses:

over the dome and made to impinge upon the Y EDGAR TATE, guiding and inclosing surfaces of the radiator, l ALFRED H. DAVIS. 

